The concept of "sin" is what religions use to create fear in the masses. If you fear going against the rules a God sets up with a great punishment stated, you then get to subjigate those that follow.
It helps us to see that God has high standards and we must measure up to them. If we do we will benefit ourselves and be guided in the way we should walk. If we pay attention to God's commandments! Then our peace would become just like a river." Isaiah 48: 17:18